Question 1 Report
How long does it take a 750W heater to raise the temperature of 1kg of water from 20oC to 50oC [specific heat capacity of water = 4200Jkg-1K-1]
Answer Details
Heat energy = Elect. energy
mcθ θ = power x time
1 x 4200 x (50 - 20) = 750 x t
t = 168s